Sociolinguistics is the study of how language is related to society. It also studies how people affect language usage. Sociolinguistics studies how variety in language changes between groups of people because of things such as race, gender, status, age, etc.
A sociolinguist might research how a particular variety of language (vernacular) would not be considered correct in a business place. Sociolinguists might also study the grammar, phonetics, and vocabulary of this sociolect. Similarly, dialectologists would study the same things for a regional dialect.
The study of language variation focuses on how language changes with social pressure and when in a specific environment. This can include code-switching, or changing from one language or dialect to another depending on the situation.
William Labov is a sociolinguist known for introducing a way to measure language variation and change. He was not the first person to study sociolinguistics, but he is known for taking the lead in sociolinguistic research in the West.
Further reading
Cook, Manuela (2019). N-V-T, a framework for the analysis of social dynamics in address pronouns. In: Bouissac, P. (Ed.). The Social Dynamics of Pronominal Systems. Amsterdam: John Benjamins. Chapter 1, pp. 17-34. {Hardbound ISBN| 978-90-272-0316-8}} and {e-Book ISBN| 978-90-272-6254-7}}
Lakoff, Robin T. (2000). The Language War. Berkeley, CA: University of California Press. ISBN0-520-21666-0
Meyerhoff, Miriam. (2006). Introducing Sociolinguistics. New York: Routledge. ISBN0-415-39948-3
Milroy, Lesley and Gordon. Matthew. (2003) Sociolinguistics: Method and Interpretation London: Blackwell Publishing. ISBN0-631-22225-1. (More advanced, but has lots of good examples and describes research methodologies to use.)
Paulston, Christina Bratt and G. Richard Tucker, editors. 1997. The early days of sociolinguistics: memories and reflections. (Publications in Sociolinguistics, 2.) Dallas: Summer Institute of Linguistics.
Trudgill, Peter. (2000). Sociolinguistics: An Introduction to Language and Society(4th Ed.). London: Penguin Books. ISBN0-14-028921-6 This book is a very readable, if Anglo-centric, introduction for the non-linguist.
Watts, Richard J. (2003). Politeness. Cambridge: Cambridge University Press. ISBN978-0-521-79406-0. A sociolinguistics book specializing in the research in politeness. It's a little tough at times, but very helpful and informational.
References
↑Paulston, Christine Bratt and G. Richard Tucker, eds. Sociolinguistics: The Essential Readings. Malden, Ma.: Wiley-Blackwell, 2003.
↑Kloss, Heinz (1976). "Abstandsprachen und Ausbausprachen" [Abstand-languages and Ausbau-languages]. In Göschel, Joachim; Nail, Norbert; van der Elst, Gaston (eds.). Zur Theorie des Dialekts: Aufsätze aus 100 Jahren Forschung. Zeitschrift für Dialektologie and Linguistik, Beihefte, n.F., Heft 16. Wiesbaden: F. Steiner. p.310. OCLC2598722.
↑Ammon, Ulrich (1995). Die deutsche Sprache in Deutschland, Österreich und der Schweiz: das Problem der nationalen Varietäten[German Language in Germany, Austria and Switzerland: The Problem of National Varieties] (in German). Berlin & New York: Walter de Gruyter. pp.1–11. OCLC33981055.
↑Paolillo, John C. Analyzing Linguistic Variation: Statistical Models and Methods CSLI Press 2001, Tagliamonte, Sali Analysing Sociolinguistic Variation Cambridge, 2006